Crosshatching device



y 1950 F. M. I Di MARIA 2,513,404

CROSSHATCHING DEVICE Filed 001;. 51, 1947 BY W-W A TTORNEYS.

WITNESSES Patented July 4, 1950 UNITED OFFICE i H r 2,513,411; v

' CROSSHATCHINGDEVICE F r ndo piMarim Philadelphia, Pa. ApplicatiomOctober 31, 194-7, Serial No. 783,329

I .1, claim.

v This invention has general reference to -draftsrnans triangles or the like while it relates, more particularly, to the species or form thereof designed to enable the lining or cross-hatching. of sectio a pa o areas With pa l e ua y spaced lines.

liereteiior a m t ha e e .m e t pr .rid de pable of d a in s tion indicat n ine i all h tre iance u o t huma eye Q th u of a a 1" spa insd d s wi h Martins succes t he egr 9 a racy and neatness has been uncertain; while the use of such deviceshas beenlimited mainly due to the time-consumed in adjusting such device and their lack of facile manipulation.

,It is,. accordingly, a primary object of my invention to overcome the noted disadvantages by providing a sectional-lining device or draftingtriangle which can be easily adjusted and set for the desired line spacing; and which is capable of :use with the same ease as an ordinary triangle forcross-hatching and positive assurance that all of the lines drawn will be equally spaced and the fa ce of the drawing unmarred.

Another object of my invention is to provide a sectional-lining drafting triangle including means,.preferably adjustable relative to the hypotenuse side or edge of such triangle, with assurance that the cross-hatching will be drawn in uniform parallelism.

A further object of my invention is to provide a sectional-lining drafting-triangle which greatly facilitates the section lining operation, and that is simple to construct; cheap to manufacture; and which will slide smoothly over the surface of the drawing area to be cross-hatched, wholly or in part.

A still further object of my invention is to provide a sectional-lining drafting-triangle in which the hypotenuse serves as the ruling edge and by the use of which each line drawn serves as a guide for progressively drawing the requisite plurality of equally spaced parallel lines to cover the sectional area.

With the foregoing objects and ancillary advantages in view my invention essentially consists in the features of construction, combinations of elements and arrangements of parts hereinafter described and illustrated by the accompanying sheet of illustrative drawings; wherein:

Fig. 1 is a plan view of a draftsmans triangle typically including the improvements of this invention.

Fig. 2 is a side or edge view of Fig. I viewed 2 looking from .the right towards the left-hand thereof.

Fig. 3 is a perspective View of a movable slide which when set at the required adjustment positively ensures all section lines drawn being in equally .spaced parallelism.

Fig. 4 is a larger scale section taken as indicated by the arrowsIV...IV in Fig. l; and,

Fig. 5 is an underside plan .view of Fig.4.

In describing the form of my invention exemplified in the sheet of drawings herewith, specific terms will be employedlfor-the sake of clarity, but

itis to be understoodthe scope of said invention is not thereby limited; each such term being intended to embrace allequivalents which perform .the same function for .an analogeous .purpose.

Referring more in detail to the drawings the reference character :6 designates, for example only,;aconv.entional forty-five degree draftsmans triangleand 1 indicates the hypotenuse or ruling edge thereof. The'triangle .6 is preferably made of suitable transparent material and it is provided with an appropriate scale 8 medially lo,- cated at right-angles to the hypotenuse I, for a purpose hereinafter setforth.

Conveniently, although not essentially, in line with the forty-live degree angular ends of the centrally located opening 9 throughthe triangle .6 I :drill spaced holes I0, Figs. .4 and 5, for the reception of shouldered retainer-studs II each having a comparatively thin polygonal or rectangular head I2 for snug seating in a correspondingly shaped recess l3, provided for the purpose in the underside of the triangle 6, and whereby said retainer-studs are held stationary, in an obvious manner. The relatively reduced shank I4 of each clamp-stud beyond the shouldered part II is screw-threaded for engagement by an appropriate circumferentially knurled clamp-nut I5 and an associated lock-collar I6. The lockcollars I6 afford guidance for a rectangular linespacing element or strip I'I provided with parallel inclined slots I8 slidably engaging the lock-collars I6. The slots I8 are inclined at a definite angle for maintenance at all times of the outer edge I9 of the strip I'I parallel with the hypotenuse I of the triangle. The slots I8 are inclined preferably at an angle of thirty-degrees with respect to the longitudinal edges of the strip I1, and said strip is clamped down by aid of the nuts I5 when set at the requisite adjustment, or desirable spacing, for the section lining to be made. Incidentally it will be readily seen from an examination of Fig. 4 that the lock-collars I6 are 3 of larger diameter than the subjacnt shouldered part of the retainer studs I I so that the triangle 6 is rigidly clamped to said studs; also that by making the base portion 20, Fig. 4, of each nut I5 of relatively larger diameter than the lockcollars I6 the strip or line spacing element I'I is correspondingly clamped down onto the triangle 6. In other words, when the element I1 is set at the required adjustment, determined by the scale 8, it is firmly secured against displacement relative to the triangle hypotenuse or ruling edge 1. i

From the foregoing it will now be clearly ap parent that the user of the triangle 6 when crosshatching is to be done, simply releases the clampnuts I5 and moves the strip over the scale 8 to the desired spacing extent, intermediate one sixteenth of an inch up to one inch in the showing of said scale, and then tightens up the nuts I5. The user of the triangle now draws an initial line along the hypotenuse edge I, whereupon said triangle is simply moved along the T-square blade, or a straight edge, until the previously drawn line coincides with the longitudinal outer or guide edge I9 of the strip I7 and draws the next line. This operation is consecutively repeated until the area to be cross-hatched is completed. This simple operation or manner of using my improved sectional-lining device not only greatly speeds up cross-hatching but is a time and labor saving instrumentality; while it is to be noted that the triangle 6 when set can be handled with the same case and facility as an ordinary triangle without the aid of any additional instrument or line spacin marker. Also, by the obviously simple set-up of my improved triangle 6 the parts II, I5 and I! can be readily removed and the said triangle used as ordinarily, and vice versa. It will, also, be appreciated by those acquainted with the art that my improvements are equally applicable to the hypotenuse side of a sixty-thirty degree di'aftmans triangle by the simple expedient of changing the angular inclination of the slots I8 in the spacingstrip I'I,

so that the ruling edges 1 and I9 would be main triangle and correspondingly so for a sixty-thirty degree triangle.

relative to the hypotenuse edge of the triangle;

2, line spacing strip on the triangle movable over said linear scale towards and away from the hypotenuse edge of the triangle; parallel slots in the spacing strip inclined at a definite angle relative to the horizontal and efiective to maintain the outer edge of said spacing strip always parallel to the hypotenuse edge of the triangle; clamping elements, each in the form of a shouldered stud having a comparatively thin noncircular head at one end for seating in a complemental shaped hole in the triangle to hold said studstationary, each'said stud also including a relatively reduced screw-threaded shank for respective passage through the inclined slots in the line spacing strip; a lock collar of larger diameter than the shouldered part of the stud shank engaged in the associated inclined slot of the line spacing strip to afford movable guidance for said strip; and a nut on the threaded portion of the shouldered shank of the stud to secure the spacing strip at the required adjustment. I

FERNANDO M. DI MARIA.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES 'PATENTS Number Name Date 967,431 Porter Aug. 16,1910 1,313,168 Di Maio Aug. 12, 1919 2,006,285 Von Zimmerman June 25, 1935 2,168,694 Zachs Aug. 8, 1939 FOREIGN PATENTS Number Country Date 22,663 Sweden June 12,1906 842,139 France Feb. 27,1939 

